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evalhf/constant

constants known to evalhf

Description

 • The following constants are known to evalhf:

 Pi gamma Catalan true false FLT_RADIX DBL_MANT_DIG DBL_DIG DBL_EPSILON DBL_MIN_EXP DBL_MIN DBL_MIN_10_EXP DBL_MAX_EXP DBL_MAX DBL_MAX_10_EXP LNMAXFLOAT

 • evalhf(Digits) returns the approximate number of digits of the hardware floating-point system in use, regardless of the actual setting of Digits. This constant takes into account the precision returned by the standard mathematical functions.
 • Inside evalhf, true has the value 1.0 and false has the value 0.0.
 • The following constants are taken from the ANSI-C definition of floating-point parameters of an IEEE-standard floating-point system.
 • FLT_RADIX: The base (or radix) of the floating-point number system.
 • DBL_MANT_DIG: The number of significant base digits.
 • DBL_DIG: The (approximate) equivalent number of significant decimal digits.
 • DBL_EPSILON: The smallest positive x such that $1.0+x\ne 1.0$
 • DBL_MIN_EXP: Minimum normalized exponent
 • DBL_MIN: Minimum normalized positive number
 • DBL_MIN_10_EXP: Minimum exponent of a representable power of 10
 • DBL_MAX_EXP: Maximum exponent
 • DBL_MAX: Maximum number
 • DBL_MAX_10_EXP: Maximum exponent of a representable power of 10
 • LNMAXFLOAT: A number slightly smaller than the largest number x such that evalhf(exp(x)) and evalhf(exp(-x)) both successfully compute, and such that the results of those computations can continue to be used in evalhf.  On most machines, this value is set as evalhf(-ln(DBL_MIN)) truncated to 6 decimal places.